//多个暴露

console.log(arguments);
function add(a,b){
    console.log(a+b);
}

function sum(a,b){
    console.log(a-b);
}

function c(a,b){
    console.log(a*b);
}

module.exports = {
    add : add,
    sum: sum,
    c: c,
}
